changing the engine characteristics

[rzide]

Is it possible to make the 300 gasser closer to an mx style engine feel? I like the power and ability to lug but I currently find myself wanting WAY more mid and top end. I occasionally hit the mx track and ride mostly at a faster pace.
What if anything needs to be done? Is it sensible?

p.s. Im watching supercross which has more than likely has promoted this post lol

 

[jt633]

Try finding an mc or 2k1 ignition and port it

 

[rzide]

whats an mc or 2k1 ignition? is one better than the other? where can I find such parts?

 

[Jakobi]

Think about a motocross bike running a flywheel weight and how that smooths out the delivery. A stock enduro bike running a big lighting coil/stator is like a big flywheel weight. Go to a smaller one and the bike will spool up quicker.

Can shift the power around a bit too through port timing/porting mods as well as the PV.

 

[jt633]

Mc is the motocross version 250cc gasgas bike and some refer to ignitions as

2k1 = motocross or mc igntion ( light flywheel no lighting capabillity)

2k2 = offroad or de dealer edition ( more aggressive offroad ignition with low output lighting capabillity)

2k3 = offroad or ec ignition (heavy flywheel high light output) gives same effect as a flywheel weight would,

Some ktm ignitions cross over if you look at them closley

 

[rzide]

so to keep the lights I can't really switch to a light weight flywheel set up? I would prefer to keep the lights.

 

[jt633]

You gotta weigh both options and get what you want ya kno? Porting sounds like best option and get carb modded

 

[andoman]

Some of the 300's came with a 36mm carb. If you don't have a 38mm you need one.

 

[Jakobi]

Some have also seen top end gains by changing out the Q silencer. Raising the ports and having the head setup will improve things as well.

 

[rzide]

Is raising the ports and the RB designs head mod the same thing?

 

[Zman]

You can raise the ports by adding some base gaskets to change your port timing and then have RB cut the head to get your compression and squish set correctly. This should achieve your desired results. Which ignition do you have now? 2k2 or 2k3?

 

[jt633]

I hear the doma pipe makes the bike a little snappier but personally have never tried it

 

[john r b]

He has a 2k3 = '13 300 e-start. Get the squish measured up and send the head out to Ron.

 

[Jakobi]

As above. Base gakets will lift the entire cylinder (and raise the ports). The other option is to have someone put in some time reporting the cylinder and will cost a truck load and still doesn't mean you'll get the result you're after, and if its not its not so easy to undo.

Once the port timing is where you want it, take some squish samples and have the head cut. This will reduce the piston to squish band angle, reduce the piston to squish band clearance, and then correct the volume to ensure an appropriate compression ratio is achieved.